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EP1198361B1 - Systeme de mesure de la pression - Google Patents

Systeme de mesure de la pression Download PDF

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Publication number
EP1198361B1
EP1198361B1 EP20000949733 EP00949733A EP1198361B1 EP 1198361 B1 EP1198361 B1 EP 1198361B1 EP 20000949733 EP20000949733 EP 20000949733 EP 00949733 A EP00949733 A EP 00949733A EP 1198361 B1 EP1198361 B1 EP 1198361B1
Authority
EP
European Patent Office
Prior art keywords
pressure
chamber
diaphragm
monitoring system
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP20000949733
Other languages
German (de)
English (en)
Other versions
EP1198361A1 (fr
Inventor
David Vile
John Beckley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Transense Technologies PLC
Original Assignee
Transense Technologies PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Transense Technologies PLC filed Critical Transense Technologies PLC
Publication of EP1198361A1 publication Critical patent/EP1198361A1/fr
Application granted granted Critical
Publication of EP1198361B1 publication Critical patent/EP1198361B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0491—Constructional details of means for attaching the control device
    • B60C23/0494—Valve stem attachments positioned inside the tyre chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L17/00—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0001—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
    • G01L9/0008—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using vibrations
    • G01L9/0022—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using vibrations of a piezoelectric element
    • G01L9/0025—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using vibrations of a piezoelectric element with acoustic surface waves

Definitions

  • This invention relates to a pressure monitoring system and, in particular, a system for monitoring the air pressure within a pneumatic wheel.
  • US patent specification No. 5289160 discloses a tyre pressure monitoring system in which a pressure sensor switch closes if the tyre pressure falls below a given value relative to the external ambient pressure to trigger a warning system.
  • the pressure sensitive switch comprises biasing means the action of which is resisted by the tyre pressure but if the tyre pressure falls too low relative to atmospheric pressure, the biasing means causes an electrical switch to close so as to generate a warning signal.
  • This system uses a surface acoustical wave (hereinafter referred to by the acronym "SAW" device as a transponder to transmit the warning signal to a remote sensor.
  • SAW surface acoustical wave
  • US 5585571 upon which the precharacterising clause of claim 1 is based, discloses apparatus for measuring strain by means of a pair of SAW devices.
  • SAW devices are mounted on opposite sides of a diaphragm which is exposed to atmosphere on one side and to tyre pressure on the other side. The signals from the two SAW devices are then mixed to provide a temperature compensated signal indicative of the tyre pressure.
  • the present invention aims to improve upon these known systems.
  • a pressure monitoring system comprising a first pressure chamber and a second pressure chamber separated by a diaphragm, a first SAW device having a first resonant frequency mounted on one side of the diaphragm and a second SAW device having a second resonant frequency mounted on the other side of the diaphragm, whereby if the pressure P 2 in the second chamber falls or rises relative to the pressure P 1 in the first chamber, the diaphragm will deflect so one side thereof is subject to tension and the other side hereof is subject to compression, the first and second SAW devices being arranged to sense this deflection by sensing said tension and compression and hence provide an output indicative of the chamber of the pressure P 2 in the second chamber relative to the pressure P 1 in the first chamber characterised by the first chamber being arranged to be pressurised to a predetermined pressure P 1 and to remain at that pressure and the second chamber being arranged to initially be pressurised to a pressure P 2 equal to pressure P 1
  • the SAW devices can be used to provide a measure of the pressure differential between the two chambers, and the pressure in the first chamber can be set to, in effect, store the desired pressure.
  • the pressure in the second chamber (which may, for assistance, be in communication with the air pressure within a pneumatic wheel), falls relative to this stored pressure, a warning signal is generated by the pair of SAW devices.
  • the SAW devices provide a temperature compensated signal and can be used as a transponder to transmit the warning signal to a remote sensor.
  • an inflation valve including a pressure monitoring system of the invention.
  • the present invention still further provides a wheel and pneumatic tyre assembly including an inflation valve according to the invention.
  • Figures 1A, 1B and 1C show first and second SAW devices 1, 2 mounted on opposite sides of a central substrate which may be used as a diaphragm.
  • Each SAW device is housed within a cover 4, 5 which protects it from the environment and is mounted on opposite sides of a piezoelectric substrate 6 (such as quartz or thin film zinc oxide) as shown in Figure 1A.
  • the properties of the central substrate e.g. it stiffness and/or electrical conductivity, can be altered by using a multiple layer substrate.
  • Figure 1B shows the use of single-sided SAW devices mounted on piezoelectric substrates 6A, 6B mounted back to back and
  • Figure 1C shows an embodiment in which a further structural layer 6C e.g. a metal or plastics layer, is used between the piezoelectric substrates 6A and 6B.
  • Figures 1A, 1B and 1C also show electrical connection pads 3A and 3B for connecting the SAW devices to an aerial and to a ground plane.
  • This arrangement contrasts with many conventional arrangements of SAW devices in which one device is used as a measuring element and another is used as a reference. With the differential arrangement, there is no need for a reference SAW and the sensitivity is increased as the two devices are subject to equal and opposite strains. Also, the diaphragm is normally unloaded (when the pressures on opposite sides thereof are equal) so avoiding ageing problems and enabling the measurement of higher pressures.
  • FIG 2 shows an embodiment of the invention in which a diaphragm 7 is provided with a SAW device 8, 9 on opposite sides thereof, for example in the manner described in relation to Figures 1A, 1B and 1C, and mounted within a housing 10, e.g. formed of plastics.
  • the housing 10 defines a first chamber 11 on one side of the diaphragm 7 and a second chamber 12 on the other side of the diaphragm.
  • the diaphragm separates the two chambers 11 and 12 and provides a seal therebetween.
  • the first chamber 11 is closed by a one-way valve 13 which lets air (or other gas) into the chamber 11 but prevents air from escaping from the chamber 11.
  • the second chamber 12 is in communication with the pressure to be monitored.
  • the one-way valve may be a simple disk with a slot in it arranged to open when pressure is applied to one side thereof but other types of one-way valve may be used.
  • Figure 3 is schematic diagram illustrating the manner in which the pressure sensing system operates. It shows the diaphragm 7, housing 10 and chambers 11 and 12 as described above.
  • the chambers 11 and 12 may be pressurised by a source of pressured air via conduits 14 and 15, with a non-return valve 13 shown in conduit 14.
  • Chamber 11 When the system is first pressurised, the pressure P 1 in chamber 11 and the pressure P 2 in chamber 12 will be equal. Chamber 11 then, in effect, stores the value of P 1 as the one-way valve 13 prevents air escaping from chamber 11.
  • Chamber 12 is in communication with the pressure to be monitored, e.g. the tyre pressure, which may be subject to variation, e.g. due to slow leaks or puncture. If the pressure P 2 in chamber 12 falls relative to pressure P 1 in chamber 11, the diaphragm 7 will deflect and the SAW devices will sense this and provide a warning signal.
  • Processing means can be utilised to subtract the output of the first SAW device and from the output of the second SAW device, or vice versa, to provide an indication of the pressure differential between the first 11 and second 12 chambers.
  • Such an arrangement can be used to monitor type pressure.
  • chamber 11 stores the initial pressure and if, over time, the pressure P 2 in chamber 11 falls relative to this stored pressure a warning signal is generated. If the tyre is over-inflated initially, this simple embodiment would store the incorrect, over inflated pressure in chamber 11. However, this problem can be avoided by using an inflator which can be pre-set to inflate the tyre to a selected pressure.
  • FIG 4 is a cross-sectional view of an embodiment of a valve, such as a vehicle wheel valve, incorporating a pressure monitor as described above.
  • the pressure monitor is mounted at the inner end of the valve body 18.
  • a fist Schraeder valve 19 is provided to function as the one-way valve 13 shown in Figure 3 enabling air to enter the first chamber 11 but not to escape therefrom.
  • a second Schraeder valve 20 is provided as in a conventional inflation valve for a pneumatic tyre to allow the tyre to be inflated but prevent air escaping through the valve except by activating a release rod 21 by means of which the valve can be opened for two-way communication.
  • the pressure monitor device can be easily re-calibrated by simply inflating the tyre to the required pressure as the first chamber 11 automatically stores the peak inflation pressure.
  • SAW devices on piezoelectric substrate are that they can store and convert energy without the requirement of an external power source such as a battery and wireless radio frequency signals can be used to interrogate the devices as described in US5585571. Also, the SAW devices need only be connected to an aerial and a ground plane to enable them to transmit signals to a remote sensor, no other circuitry being required. If desired, a small processing circuit (not shown) may be mounted within the valve body 18 to process the signals received from the SAW devices.
  • Figure 4 shows metal insert 24 running the length of the valve body 18 which provides an aerial. A ground plane connection is provided by a metalised ring 25 around the body 18 which, in use, contacts the metal wheel in which the valve is inserted, (the electrical connections between these components and the connection pads 3A, 3B of the SAW devices are not shown in this figure).
  • Signals from the SAW devices can thus be transmitted to remote sensors, e.g. sensors built into the vehicle in the vicinity of the wheels and arranged to provide a warning signal on the vehicle dashboard.
  • the SAW devices may also be arranged so that each sensor provides an unique output identifying which sensor is producing a warning signal so that the warning can indicate which wheel or wheels is causing a problem.
  • the monitor described above can thus provide an inexpensive, compact device for measuring tyre pressure.
  • the device is so small and lightweight that its effect on the performance of the wheel is negligible. Yet it can provide warning of low pressure in a tyre and is capable of sensing a small drop in pressure, e.g. of 1 or 2 pounds per square inch (6.9 -13.8 x 10 3 NT/M 2 ), so can provide a waming of problems such as a slow puncture. It can also provide a warning of a sudden loss of pressure, e.g. due to a puncture, in situations where it is not immediately apparent to a driver, e.g. of a lorry tyre, trailer tyre or of a spare tyre.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Measuring Fluid Pressure (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • External Artificial Organs (AREA)
  • Pipeline Systems (AREA)

Claims (12)

  1. Système de mesure de pression comprenant une première chambre de pression (11) et une seconde chambre de pression (12) séparées par une membrane (7), un premier dispositif SAW (8) ayant une première fréquence de résonance monté sur un côté de la membrane (7) et un second dispositif SAW (9) ayant une seconde fréquence de résonance monté sur l'autre côté de la membrane, moyennant quoi si la pression P2 dans la seconde chambre (12) chute ou augmente par rapport à la pression P1 dans la première chambre (11), la membrane (7) fléchira de sorte qu'un côté de celle-ci est soumis à une tension et l'autre côté de celle-ci est soumis à une compression, le premier (8) et le second (9) dispositifs SAW étant conçus pour détecter cette flexion en détectant ladite tension et ladite compression et pour fournir ainsi une valeur indicative de la pression P2 dans la seconde chambre (12) par rapport à la pression P1 dans la première chambre (11), caractérisé en ce que la première chambre (11) est conçue pour être pressurisée à une pression P1 prédéterminée et pour rester à cette pression et la seconde chambre (12) est conçue pour être pressurisée initialement à une pression P2 égale à une pression P1, mais qui est soumise à un changement dans le temps.
  2. Système de mesure de pression selon la revendication 1, dans lequel la membrane (7) comprend une ou plusieurs couches d'un matériau piézoélectrique (6).
  3. Système de mesure de pression selon la revendication 1 ou 2, dans lequel la première chambre (11) est pourvue d'une première valve anti-retour (13) qui empêche l'air de quitter la chambre (11).
  4. Système de mesure de pression selon l'une quelconque des revendications précédentes, comprenant des moyens de traitement conçus pour soustraire la sortie du premier dispositif SAW (8) de la sortie du second dispositif SAW (9), ou vice versa, pour fournir une indication de la pression différentielle entre la première chambre (11) et la seconde chambre (12).
  5. Système de mesure de pression selon la revendication 4, dans lequel les moyens de traitement sont conçus pour générer un signal d'alarme lorsqu'une pression différentielle supérieure à un niveau donné est détectée.
  6. Système de mesure de pression selon l'une quelconque des revendications précédentes, comprenant un transpondeur pour assurer une communication sans fil entre le système et un capteur à distance.
  7. Valve de gonflage comprenant un système de mesure de pression selon l'une quelconque des revendications précédentes.
  8. Valve de gonflage selon la revendication 7, comprenant un système de mesure de pression selon la revendication 3 ou l'une quelconque des revendications dépendantes de celle-ci, ayant une seconde valve anti-retour (20) à travers laquelle est fourni de l'air de gonflage et ayant un mécanisme de purge (21) qui peut être actionné pour empêcher l'écoulement d'air à travers celui-ci dans la direction opposée.
  9. Valve de gonflage selon la revendication 8, dans laquelle la première valve anti-retour (13) a également un mécanisme de purge (22) pour permettre à l'air de s'échapper de la première chambre (11), la première (13) et la seconde (20) valves anti-retour étant interconnectées de telle sorte que l'action du mécanisme de purge (21) de la seconde valve anti-retour (20) agisse également sur le mécanisme de purge (22) de la première valve anti-retour (13).
  10. Valve de gonflage selon l'une quelconque des revendications 7 à 9, comprenant une pièce rapportée métallique (24) ayant la fonction d'une antenne.
  11. Valve de gonflage selon l'une quelconque des revendications 7 à 10 qui prend la forme d'une valve de gonflage pour un pneu.
  12. Ensemble roue et pneu comprenant une valve de gonflage selon la revendication 11.
EP20000949733 1999-07-28 2000-07-28 Systeme de mesure de la pression Expired - Lifetime EP1198361B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9917579 1999-07-28
GB9917579A GB2352814B (en) 1999-07-28 1999-07-28 Pressure monitor system
PCT/GB2000/002929 WO2001007271A1 (fr) 1999-07-28 2000-07-28 Systeme de mesure de la pression

Publications (2)

Publication Number Publication Date
EP1198361A1 EP1198361A1 (fr) 2002-04-24
EP1198361B1 true EP1198361B1 (fr) 2004-10-27

Family

ID=10857995

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000949733 Expired - Lifetime EP1198361B1 (fr) 1999-07-28 2000-07-28 Systeme de mesure de la pression

Country Status (12)

Country Link
US (1) US6715355B2 (fr)
EP (1) EP1198361B1 (fr)
JP (1) JP2003505680A (fr)
KR (1) KR20020015072A (fr)
CN (1) CN1196606C (fr)
AT (1) ATE280681T1 (fr)
AU (1) AU6300800A (fr)
BR (1) BR0012790A (fr)
CA (1) CA2384333A1 (fr)
DE (1) DE60015339T2 (fr)
GB (1) GB2352814B (fr)
WO (1) WO2001007271A1 (fr)

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US7886610B2 (en) * 1999-07-19 2011-02-15 Donaldson Company, Inc. Differential pressure gauge for filter
GB0007325D0 (en) * 2000-03-27 2000-05-17 Atherton Eric High temperature sensor
GB2406171B (en) * 2000-09-08 2005-05-04 Automotive Tech Int Vehicle wireless sensing and communication system
WO2002020287A1 (fr) * 2000-09-08 2002-03-14 Automotive Technologies International, Inc. Systeme de detection et de communication sans fil pour vehicule
GB0024813D0 (en) 2000-10-10 2000-11-22 Transense Technologies Plc Pressure monitoring device incorporating saw device
CN100338451C (zh) 2002-03-21 2007-09-19 传感技术有限公司 结合有表面声波器件的压力监测器
US7669465B2 (en) * 2002-04-10 2010-03-02 John Becker Systems and methods for maintaining air pressure in tires
FI116097B (fi) * 2002-08-21 2005-09-15 Heikki Ruotoistenmaeki Voima- tai paineanturi ja menetelmä sen soveltamiseksi
US7116213B2 (en) 2002-11-22 2006-10-03 Michelin Recherche Et Technique S.A. Acoustic wave device with modulation functionality
US7096736B2 (en) * 2003-08-04 2006-08-29 The Goodyear Tire & Rubber Company Passive tire pressure sensor and method
US7005987B2 (en) 2003-10-30 2006-02-28 Michelin Recherche Et Technique S.A. Acoustic wave device with digital data transmission functionality
US20050109095A1 (en) * 2003-11-20 2005-05-26 Sinnett Jay C. Saw transducer interface to pressure sensing diaphragm
USD518146S1 (en) * 2004-05-19 2006-03-28 Juergen Schreiner Inflation valve
US7265478B2 (en) * 2004-06-04 2007-09-04 Michelin Recherche Et Technique S.A. RF calibration of saw interrogators
GB2415506A (en) * 2004-06-22 2005-12-28 Transense Technologies Plc SAW based tyre pressure sensor for retro-fitting to inner end of existing inflation valve
US7129828B2 (en) * 2004-07-20 2006-10-31 Honeywell International Inc. Encapsulated surface acoustic wave sensor
DE102005001097A1 (de) * 2005-01-08 2006-07-27 Abb Patent Gmbh Drucksensor (I)
CN101208730A (zh) 2005-06-29 2008-06-25 米其林技术公司 存储声表面波校准系数的射频识别
US7405675B2 (en) 2006-01-19 2008-07-29 Michelin Recherche Et Technique S. A. System and method for reducing search time and increasing search accuracy during interrogation of resonant devices
EP1993856B1 (fr) 2006-03-14 2011-06-01 Michelin Recherche et Technique S.A. Mécanisme de déclenchement piézoélectrique
FR2898542B1 (fr) * 2006-03-14 2008-05-30 Michelin Soc Tech Vehicule comportant au moins un ensemble monte et utilisation d'un systeme de mesure.
FR2903752B1 (fr) * 2006-07-13 2008-12-05 Michelin Soc Tech Valve de pneumatique.
US20080100429A1 (en) * 2006-11-01 2008-05-01 Lear Corporation Tire pressure monitoring (tpm) and remote keyless entry (rke) system for a vehicle
CN102131659B (zh) * 2008-08-29 2015-03-18 米其林集团总公司 一维轮胎装置
US7779682B2 (en) * 2008-10-06 2010-08-24 Kulite Semiconductor Products, Inc. Dual purpose pressure sensor
CN101791932B (zh) * 2009-02-01 2011-12-07 傅黎明 一种爆胎胎压监测模块
GB2480628A (en) * 2010-05-25 2011-11-30 Horstman Defence Systems Ltd A suspension unit for use on a tracked vehicle including a load sensor
FR2982022A3 (fr) * 2011-10-28 2013-05-03 Ect Ind Systeme de mesure de contraintes autonome
CN102922962B (zh) * 2012-11-12 2016-03-30 西安交通大学 一种无源无线微型胎压传感器
CN103303076A (zh) * 2013-06-17 2013-09-18 天津云视科技发展有限公司 一种使用声表面波压力传感器的汽车胎压实时监测装置
GB2594991B (en) * 2020-05-15 2022-09-07 Continental Automotive Gmbh Valve stem, tyre parameter monitoring system and method for mounting a tyre parameter monitoring system onto a wheel rim of a vehicle

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Also Published As

Publication number Publication date
GB2352814A (en) 2001-02-07
CA2384333A1 (fr) 2001-02-01
ATE280681T1 (de) 2004-11-15
CN1365321A (zh) 2002-08-21
CN1196606C (zh) 2005-04-13
WO2001007271A1 (fr) 2001-02-01
KR20020015072A (ko) 2002-02-27
US6715355B2 (en) 2004-04-06
BR0012790A (pt) 2002-04-30
GB2352814B (en) 2003-04-09
AU6300800A (en) 2001-02-13
US20020117005A1 (en) 2002-08-29
DE60015339T2 (de) 2005-10-20
GB9917579D0 (en) 1999-09-29
DE60015339D1 (de) 2004-12-02
JP2003505680A (ja) 2003-02-12
EP1198361A1 (fr) 2002-04-24

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